The 'Days of Atonement Novel' might have a variety of themes. If we consider the general idea of atonement, it could explore themes of guilt and how it affects a person's life. It may also look at the journey of self - discovery as part of the process of atoning. Additionally, the time period or setting of the 'days' in the title could introduce themes related to the passage of time, change, and the evolution of characters within that time frame. For example, if it's set in a historical period, it might deal with how society's views on atonement have changed over time and how the characters are influenced by those views.
Since I don't have first - hand knowledge of the 'Days of Atonement Novel', it's difficult to say for certain. However, from the title, 'atonement' is a key word. So, themes of making amends, facing one's past mistakes, and the process of spiritual or emotional cleansing could be present. It could also deal with themes of family and community, as often these are the contexts in which atonement takes place.
I'm not entirely sure as I haven't read it. But common themes in many novels could be love, redemption, and forgiveness. It might be that 'Days of Atonement Novel' also explores these themes, or perhaps it has themes related to the search for identity or the struggle between good and evil.